|#|Wrestlers|Reign|Date|Days held|Location|Notes|
|---|---|---|---|---|---|---|
|1|Kuishinbo Kamen|1|January 4, 2001|758|Osaka, Japan|Kamen defeated Ebessan to become the first champion.|
|2|Ebessan|1|February 1, 2003|56|Osaka, Japan||
|3|Pero|1|March 29, 2003|7|Osaka, Japan||
|4|Ebessan|2|April 5, 2003|92|Osaka, Japan||
|5|Tigers Mask|1|July 6, 2003|90|Osaka, Japan||
|—|Vacant|—|October 4, 2003|—|N/A|Tigers Mask vacated the title to enter the Tennozan 2003 tournament.|
|6|Miracle Man|1|December 7, 2003|55|Osaka, Japan|Miracle Man won a 4-Way Match which included Ebessan, Kuishinbo Kamen, and Pero to win the vacant championship.|
|7|Ebessan|3|January 31, 2004|21|Osaka, Japan||
|8|Kuishinbo Kamen|2|February 21, 2004|665|Osaka, Japan||
|—|Stripped|—|December 17, 2005|—|N/A|Kamen was stripped of the title due to a lack of title defenses.|
|9|Policeman|1|February 18, 2006|311|Osaka, Japan||
|10|Okita-kun|1|February 26, 2006|314|Osaka, Japan|Okita-kun won an Eight-Man Battle Royal last eliminating Policeman.|
|—|Vacant|—|January 6, 2007|—|N/A|Okita-hun vacated the title due to an ear injury on September 16, 2009|
|11|Sgt. Suchi|1|February 12, 2007|194|Osaka, Japan|Sgt. Suchi is a comedian who won a Battle Royal, last eliminating Miracle Man and Kuishinbo Kamen.|
|12|Ebessan III|1|August 25, 2007|113|Osaka, Japan||
|13|Kuishinbo Kamen|3|December 16, 2007|84|Tokyo, Japan||
|14|Miracle Man|2|March 9, 2008|51|Tokyo, Japan||
|15|Kanjyuro Matsuyama|1|April 29, 2008|0|Tokyo, Japan|Matsuyama retires the title immediately after the match and declares himself the first Osaka Pro Wrestling Owarai Champion.|
|16|Kuishinbo Kamen|4|April 29, 2010|59|Osaka, Japan|Kamen wins both the Owarai Championship and the re-activated Osaka Meibutsu Sekaiichi Championship.|
|17|Kyusei Ninja Ranmaru|1|June 27, 2010|22|Osaka, Japan|Ranmaru wins both titles.|
|18|Kuishinbo Kamen|5|July 19, 2010|1435+|Osaka, Japan|Kamen wins both titles.|

Question: how many matches were in 2007?
Answer: 4